JPS5977339A - Method for measuring surface water of aggregate - Google Patents

Abstract

PURPOSE:To compute the surface moisture ratio of the aggregate used in concrete, by injecting an adequate amount of water in a measuring tank having a specified volume, filling the aggegate in the tank, further injecting water to fill up the tank, and measuring the weight at each stage. CONSTITUTION:An adequate amount of water is injected in a measuring tank 6 from a water injecting pipe 21. The weight Wo (g) of the water is measured by load cells 25a and 25b. Then, aggregate is put in, and the weight Ws (g) of the aggregate and the water is measured. The water is further injected and the measuring tank is filled up. The weight W (g) of the aggregate and the water at this time is measured. The surface moisture ratio P (%) of the aggregate to be measured can be computed by the expression P={(Ws-Wo)X(1-1/S)/(W-Wc)- 1}X100, where S is the surface dry specific gravity of the aggregate and Wc (cm<3>) is the volume of the measuring tank.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to C: a method for measuring the necessary aggregate surface water percentage for adjusting the respective calculated values of bone loss and water used when concrete is mixed.

For example, in concrete, cement.

The mixing ratio of sand, gravel, and water to a certain ratio is a major factor in obtaining the workability and quality of concrete, and the strength of concrete is determined by the ratio of water to cement. It is known that when using a string, cement can be mixed in a stationary manner using an M-meter, but sand and gravel are sometimes used with surface C; moisture adhering to them, so the amount of surface water is added. Otherwise, the weight of the aggregate cannot be measured accurately, and the amount of water added cannot be determined accurately unless the amount of water adhering to the aggregate is subtracted.

Conventionally, in order to measure this amount of surface water, the second method was to detect it by static acupuncture capacitance due to current conduction, or to measure the diffuse reflection energy ratio of two types of infrared light: wavelengths that are absorbed by water and wavelengths that are not. A method is used to detect the fast neutrons emitted from the fast neutron source by the hydrogen nuclei of the hydrogen element that makes up water, and the rate at which the fast neutrons are converted into thermal neutrons.These measured values are measured by each detector. From the arithmetic circuit (
The two-component exchanger performs various signal processing to convert the moisture content into a display signal.Based on the display signal, for example, the operation panel of a batcher plant can perform manual/assistance correction or automatic control. Then, the amount of water added and one piece of aggregate are adjusted.

However, with any of these methods, particles of the aggregate, which is the object to be measured, may adhere to the sensitive part of each detector17, or the particle size of the aggregate may change, or the aggregate may be in a consolidated state. The detection accuracy of the detector decreases when the bulk volume changes, or even when the water contains C: salt. It becomes l2.

An object of the present invention is to provide a method for measuring aggregate surface water that does not cause such problems. Inside the measuring tank C with a certain volume: Appropriate water, measuring tank
The aggregate, which is the proboscis, is added (1) Add water in the order of filling and inject, and measure the weight at each stage. The surface water rate of the object to be measured is calculated to calculate the amount of paddy.

This will be explained below based on the first to third illustrated embodiments 1m.

In the illustrated example, cement,
Aggregates, water, and admixtures are supplied from a total of HQ11.2.3゜4 to mixer 5C and kneaded. The water supply calendar from the storage tank 3 and the aggregate supply amount from the storage tank 2 are controlled by measuring.

In the string, the aggregate is placed in the cylinder II diagonally downward in the storage tank 2.
2 device, and the cylinder diameter C varnish screw] 2 can be rotated by motor] 3 (when 2 is installed, C 2 and cylinder
From the opening hole of Water is supplied twice (= initially injected with elms as appropriate, and then as supplementary water that fills the measurement tank 6 after adding the aggregate mentioned above. For supply, the water overflowing from the measurement m6 is drained through the hole 22a.

22b and 22c, and in order to discharge the wastewater from the measurement tank 6, an aperture 22a (= indicates oats) is provided with a flow pipe 23. Also, water can be supplied to the measurement tank 6 from within the tank ( The metering needles 24a and 24b, which have two insertion positions, can be used to control the initial appropriate amount of water to be injected, and the metering needle 24b can be used to control the additional amount of water.
11 (The water supply is stopped from step 2. When supplying these water and aggregates (- means the weight of water when the appropriate amount of water is supplied, the weight of the water + the bone that is the object to be measured) Amount taken when material is input.

1q+- is set to measure Kit when the measuring tank 6 is full (2) by adding additional water.The measurement can be performed using load cells 25a, 25b as in the illustrated embodiment. In addition, there may be one (1) rod-type meter. Of these, the load cells 25a and 25b are
10 (from 10 to 1/4000, on the other hand, in the cylindrical shape)
/4 (a measurement accuracy of 10 degrees is obtained, and in the former case 3
It is possible to transmit the finger and, in the latter case, two digits, as each practically valid net weight to the arithmetic circuit of the microcomputer 7, which will be described later.

After measurement of Koga 1 and others, the fixed aggregate 6111 and water in tank 6 are discharged from mixer 5 (2) through discharge water horn 8. Activating the installed on-off valve 26 (this is done from step 2. In addition, after releasing the water and the aggregate to be measured, step 12 sprinkles a certain amount of water from the washing water tank 9 at tg).
16, and the aggregate to be measured that adheres to or remains on the tank wall and tank bottom (-) can be washed away and discharged into the mixer 5 (==).

Information obtained from the Conobaccha plant, i.e., weighing tank 6
(Two suitable M+=Weight of water when water is poured: Wo (/l) Weight of aggregate and water to be measured: Ws (Weight of aggregate and water to be measured when g7 measuring tank 6 is full: W ( 9) Arithmetic circuit of microcomputer 7 (two sets of variable dials, information to be included and set as constants in advance, i.e. surface dry specific gravity of aggregate to be measured: S Capacity of measuring tank: WC (csw!) The microcomputer 7 can calculate the surface water percentage P (to) of the aggregate to be measured by performing the following calculation.

This arithmetic expression is 75, so it becomes , and further ~v(+-Ws −Wo , V(3-W(3+Wc −
Theoretically (1) can be obtained as W mWs +Wc -Wo -W.

M77, Surface dry weight W of the aggregate to be measured discharged into the mixer 5
'5(7) is.

The amount of water discharged from mixer 5 (kkW' (g)) can be determined by washing.

In this way, the calculated values P, W's, and W' flied by the microcomputer 7 are sent as calculated signals to the converter 10C, where they are converted into control signals or display signals, and are used for batcher plant operation @ 10a. 4. Built-in aggregate moisture correction device allows automatic or manual correction of aggregate (2) corresponding water metering (2).

As described above, according to the present invention (1) Aggregate surface water measurement method (2), the surface dryness ratio of the aggregate to be measured + the volume of the Jt I St Tp tank, which can be set in advance as a fixed mark based on the measured weight. From a mathematical relationship, in order to calculate the moisture content from the ratio of the bone phase + Tt amount in the surface dry state to the weight of the surface water (2), in order to be able to accurately correct the aggregate surface water (2), the measuring tank (= In order to add the aggregate to be measured after adding appropriate wood water,
The air that occupies between the sand particles becomes minute, 1, IB bubbles, which can be measured immediately without being sealed by water, and the measurement error caused by air bubbles (= 1B) can be mass-produced.

[Brief explanation of the drawing]

(Figure 1 is an overall view of a batcher plant that implements the method of measuring aggregate surface water according to the present invention, and Figures 2 and 3 are partially enlarged side sectional views of the interior of the interior.) Cement storage, 2: Aggregate storage tank, 3: Water storage tank, 4: Admixture storage tank, 5: Mixer, 6: Measuring tank, 7: Microcomputer, 8: Discharge hopper, 9: Washing water tank, 10:
Converter, ]Oa: Operation panel. 11; Aggregate extraction 7 cylinder, 12 Niscrew, +3: Motor, 14: Shooter, 21: Water injection pipe, 22a, 22
b. 22c: open hole, 23 nitrogen flow tube, 24a, 24
b: 1 stitch in total, 25a, 25b: U-dossel,
26: Open/close valve. 1 person for patent: Japan Quarry Industry Co., Ltd. - Continuation of the amendment December 3, 1981 '4! I' + Director of the PL Office Kazuo Wakasugi
Dear N-7115 items displayed! 1lLlnll/157-186971, Name of the invention Method for measuring aggregate surface water 3, Person making the amendment/Relationship with 11ji I Patent applicant name Title Hiki Quarry Industry Co., Ltd. 4, Agent 101 Award (03) E139 -51
41 Address: 1-4 Nihonbashi Kokinumachi, Chuo-ku, Tokyo
Amendment 6, "r or (Wc+Wu)-(Wc+Wu)-(described in Column 7 of Detailed Description of the Invention j, Line 7 of Page 8 of the Description of Contents of Supplement 1-2)" in the subject specification of Supplement IF.
Ws -Wo) Delete XP/+00j. 71゛

Claims (1)

[Claims] Pour the desired amount of water into a measuring tank with a certain volume, fill the tank with aggregate, which is the object to be measured, and then add water to fill the tank and measure the weight at each stage. Then, the surface water percentage of the aggregate is calculated by calculating the respective weights, the volume of the measuring tank that can be determined in advance, and the surface dry specific gravity of the aggregate.